I have a Macbook Pro 15" 2018 running High Sierra and I installed Windows 10 using bootcamp. I had duet display installed on both HS and Win10, and I installed Parallels Desktop 14 on the MacOS side and had it run the bootcamp partition instead of installing a new instance of win10. I think duet display caused some problems because the MacOS version was trying to mirror with the ipad at the same as the Win10 duet display running duet display (that was dumb, I know. it was a careless accident). It crashed/stalled and I couldn't shut down or suspend win10 in Parallels. I ended up force quitting Parallels using activity monitor. Now I can't boot into windows by holding option on bootup. However, I do have the Paragon NTFS for Mac that allows me to view NTFS partitions and all my data is on there and now backed up. I'd rather not have to reinstall everything if all it takes is fiddling with the EFI partition. Any ideas?
Are you saying Windows does not appear in the Startup Manager?– David AndersonMay 13, 2019 at 0:25
There are two potential issues. 1) The Bootcamp partition may not appear if Paragon NTFS grabs it at startup. If it does, you won't be able to select it as boot partition from the running macOS either. 2) To boot it once more as a true Boot Camp drive, you need to have shut it down cleanly from Parallels, you can't start from it if it was just Suspended.– TetsujinMay 13, 2019 at 5:57
Correct, the Bootcamp partition does not show up in the startup manager.– SciGuyMay 13, 2019 at 17:05
Unfortunately, Parallels can't do anything. It just "boots" into the fake BIOS setup, as if it can't see the bootcamp partition either. I have tried deactivating Paragon NTFS for Mac and trying to shut Windows (bootcmap) down properly in Parallels, but no change in behavior.– SciGuyMay 13, 2019 at 17:07
OK, since I can read the bootcamp partition, I guess I'll just back it up and reinstall Windows. I'll first have to manually delete the bootcamp partition and resize the MacOS partition manually, since Bootcamp assistant doesn't know what to do now (fairly useless app, in my opinion!).
Thanks for everyone's input.